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HashJoinProbeBlockInputStream.h
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HashJoinProbeBlockInputStream.h
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// Copyright 2022 PingCAP, Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <DataStreams/IProfilingBlockInputStream.h>
#include <DataStreams/SquashingHashJoinBlockTransform.h>
#include <Interpreters/Join.h>
namespace DB
{
/** Executes a certain expression over the block.
* Basically the same as ExpressionBlockInputStream,
* but requires that there must be a join probe action in the Expression.
*
* The join probe action is different from the general expression
* and needs to be executed after join hash map building.
* We should separate it from the ExpressionBlockInputStream.
*/
class HashJoinProbeBlockInputStream : public IProfilingBlockInputStream
{
private:
static constexpr auto name = "HashJoinProbe";
public:
HashJoinProbeBlockInputStream(
const BlockInputStreamPtr & input,
const JoinPtr & join_,
size_t probe_index,
const String & req_id,
UInt64 max_block_size);
String getName() const override { return name; }
Block getTotals() override;
Block getHeader() const override;
void cancel(bool kill) override;
protected:
Block readImpl() override;
Block getOutputBlock();
private:
enum class ProbeStatus
{
PROBE,
WAIT_FOR_READ_NON_JOINED_DATA,
READ_NON_JOINED_DATA,
FINISHED,
};
void readSuffixImpl() override;
const LoggerPtr log;
JoinPtr join;
size_t probe_index;
ProbeProcessInfo probe_process_info;
BlockInputStreamPtr non_joined_stream;
SquashingHashJoinBlockTransform squashing_transform;
ProbeStatus status{ProbeStatus::PROBE};
size_t joined_rows = 0;
size_t non_joined_rows = 0;
};
} // namespace DB